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A3918

Allegro MicroSystems
Part Number A3918
Manufacturer Allegro MicroSystems
Description Low Voltage DC Motor Driver
Published Sep 24, 2012
Detailed Description A3918 Low Voltage DC Motor Driver Features and Benefits ▪ 2.5 to 9 V operation ▪ Internal PWM current control ▪ Synchron...
Datasheet PDF File A3918 PDF File

A3918
A3918


Overview
A3918 Low Voltage DC Motor Driver Features and Benefits ▪ 2.
5 to 9 V operation ▪ Internal PWM current control ▪ Synchronous rectification for reduced power dissipation ▪ Peak current output flag ▪ Undervoltage lockout ▪ Low RDS(on) outputs ▪ Small package ▪ Brake mode for DC motor ▪ Sleep function ▪ Crossover-current protection ▪ Thermal shutdown Description Designed for pulse width modulated (PWM) control of a low voltage DC motor, the A3918 is capable of output currents up to 1.
5 A and operating voltages from 2.
5 to 9 V.
The A3918 has an internal fixed off-time PWM timer that sets a peak current based on the selection of a current sense resistor.
An overcurrent output flag is provided that notifies the user when the current in the motor winding reaches the peak current determined by the sense resistor.
The fault output does not affect driver operation.
The A3918 is provided in a 16-contact, 3 mm × 3 mm, 0.
75 mm nominal overall height QFN, with exposed pad for enhanced thermal dissipation.
It is lead (Pb) free, with 100% matte tin leadframe plating.
Applications include the following: ▪ Digital still cameras (DSC) ▪ Cell phone cameras ▪ USB powered devices ▪ Battery powered devices Package: 16-contact QFN (suffix ES) 3 × 3 mm 0.
75 mm overall height Approximate size www.
DataSheet.
net/ Functional Block Diagram 0.
1 μF 0.
1 μF VCP CP2 CP4 CP1 CP3 0.
1 μF VBB Charge Pump +5 V Regulator SLEEP Sense FL 10 μF 10 V IN1 Control Logic IN2 Sense PWM Latch and Blanking Comparator Bridge VCP VBB OUTA OUTB SENSE RSENSE GND PAD GND GND A3918-DS Datasheet pdf - http://www.
DataSheet4U.
co.
kr/ A3918 Selection Guide Part Number A3918SESTR-T Low Voltage DC Motor Driver Packing 1500 pieces per 7-in.
reel Package 16-pin QFN with exposed thermal pad Absolute Maximum Ratings Characteristic Load Supply Voltage Logic Input Voltage Range Sense Voltage Symbol VBB VIN VSENSE Continuous Pulsed, tw < 1 μs May be limited by duty cycle, ambient temperature, and heat sinking.
Under ...


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